Verification engine
9checks on every
checks on every
address
The same nine-check pipeline as the paid API runs on every address, free or not.
The 9-Point Email Verification Checklist for Teams That Send at Volume.
Your bounce rate is the receipt, not the bill. The real charge lands on the reputation that decides whether your next send reaches the inbox at all.
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The manual
What is inside the book
Seven parts, fifty-six pages. Open any one of them — the cover page on the left, what it covers on the right.
Part One. The Problem Nobody Audits. Your list is decaying right now — and almost nobody measures it. Not because the number is hard to get, but because no one has ever been asked for it. List decay runs 2–3% per month, compounding into a fifth of the list in a year.. Two costs, landing in different places — only one shows up in a report with your name on it.. An anatomy of the five kinds of dead address.. Why last year’s cleaning does not count.. Pages 10–16
Part One · Summary
The Problem Nobody Audits
Your list is decaying right now — and almost nobody measures it. Not because the number is hard to get, but because no one has ever been asked for it.
- 01List decay runs 2–3% per month, compounding into a fifth of the list in a year.
- 02Two costs, landing in different places — only one shows up in a report with your name on it.
- 03An anatomy of the five kinds of dead address.
- 04Why last year’s cleaning does not count.
Pages 10–16
The proof
The checks a syntax tool cannot run
The manual explains these checks one at a time. Here is what they return — the exchange, the response codes, the verdict.
03 · WIRE. SMTP handshake. [email protected], score 100 Valid, verified in 280ms. connect: 220. EHLO: 250 Hello. MAIL FROM: 250 Sender OK. RCPT TO: 250 2.1.5 Recipient OK. the reply the verdict turns on. Mailbox proven. Syntax Valid format, MX Record Microsoft 365, SMTP Connect Connected, Inbox Exists Confirmed, Catch-All Validates recipients, Disposable Legitimate domain, Role Address Personal address, Free Provider Business domain, Domain Age 1y old, SPF Record found, DMARC Policy found, DKIM Signature found.
The short answer
Who is Verifox to make such promises?
We did not write this manual from research. We wrote it from the engine — the same nine checks that run on every address passing through Verifox, free tier and paid API alike.
No signup to start
Verify your first emails right here, no account, no card.
10k emails a minute
Bulk CSV in, verified list out. Same speed on every plan.
Instantly verified
Every address comes back already checked, with a confidence score.
99.99% accurate
Validated on a 10,000-address mixed benchmark including catch-all domains.
Credits never expire
1,000 free on signup. 2,500 with a work email. Pay as you go after.
Emails are never stored
Processed in memory, dropped on response. SOC 2 · GDPR · CCPA.
Take the manual.
Fifty-six pages, nine checks, one printable audit. A name and a work email, and it lands in your inbox.
100% privacy. The manual lands in your inbox, unsubscribe anytime.